I recently bought a Canon XA10 for livestream and the blackmagic intensity pro card to go with it. When I open Procaster, it has "intesnity pro" under the drop down menu of cameras but when I open it up, its just a black screen, seems like nothing is being captured from the camera.

With the Intensity Pro selected, click the 'Input Source' button. Make sure HDMI is selected, as well as the proper resolution/frame rate that the camera is outputting. If you're not sure of this value, just cycle through the options until you see active video pop up in the thumbnail at the top of the window.